Flood Hazard Analysis on National Major Facilities under Extreme Hydrologic Conditions
Abstract
In recent years, the risk of external/internal flooding of major national facilities has increased significantly due to the local intensive precipitation under climate change. For the safety of important facilities such as nuclear power plant, it is necessary to analyze the reliability of flood protection and plant response to inundation events.
Watershed hydrologic modeling and two-dimensional hydraulic simulation have been conducted to analyze the hydrologic and hydraulic characteristics of external/ internal inundation at the site. To understand the fragility of the inundation phenomena, refined walkdowns have been performed at the site to provide informations on flood protection facilities, location, critical height and conditions of seals. Flood hazard curve by frequency has been developed through a quantitative analysis of extreme rainfall, inundation depth and inundation intensity by occurrence frequency. Fragility assessment has also been carried out for major structures, systems and components(SSC) by identifying flow paths through the results of walkdowns. To evaluate the risk of flooding, the safety factor of the performance function was calculated and then safety probability assessment was suggested under various risk conditions including the failure probability of system response, occurrence probability, exposure investigation and expected loss. Through the present study, flood hazard and fragility curves can be derived for the internal/external inundation of major structures, systems and components at the site. This study will contribute to establish the probabilistic flood hazard assessment framework on national major facilities under extreme rainfall condition. Keywords: Flood Inundation; Flow Path; Fragility Analysis; Hazard Curve; Acknowlegement This work was supported by Korea Environment Industry & Technology Institute(KEITI) through Water Management Research Program, funded by Korea Ministry of Environment(MOE)(79609)- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFMPA21B1131K
- Keywords:
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- 6309 Decision making under uncertainty;
- POLICY SCIENCES & PUBLIC ISSUES;
- 6344 System operation and management;
- POLICY SCIENCES & PUBLIC ISSUES